Kusiyana kwa Zipinda za Simenti za Mapaipi a Iron Ductile EN197-1

Mapaipi achitsulo opangidwa ndi ductileamagwiritsidwa ntchito kwambiri m'mapaipi amadzi chifukwa cha mphamvu zawo zambiri, kulimba, komanso kulimba bwino. Pofuna kupewa dzimbiri lamkati ndikuwonetsetsa kuti madzi ndi abwino, nthawi zambiri amakutidwa ndi simenti (CML). Mtundu wa simenti womwe umagwiritsidwa ntchito m'mizere iyi ndi wofunikira, kutengera malo ogwiritsira ntchito komanso zofunikira pakugwira ntchito.

Muyezo waku Europe EN 197-1: 2011ndiye muyezo woyambira wofotokozera ndi kugawa simenti wamba.Simenti ya Portland, simenti yosagwira sulfure, simenti yokhala ndi alumina wambiri imagwiritsidwa ntchito kwambiri popanga mapaipi achitsulo opangidwa ndi ductile.Kusiyana kwawo kwakukulu kuli mu kapangidwe ka mchere wawo, zomwe zimakhudza mwachindunji magwiridwe antchito a nsaluyo.Tsatanetsatane wotsatira wa kusiyana pakati pa mitundu itatu ya simenti yodziwika bwino:

Simenti ya Portland: Chomangira chilichonse cha hydraulic chopangidwa kuchokera ku chisakanizo cha calcium silicate-based Portland simenti clinker, chosakwana 5% limestone kapena granulated blast furnace slag, ndi kuchuluka koyenera kwa gypsum, chimatchedwa Portland simenti, ndipo padziko lonse lapansi chimatchedwa Portland simenti.

Makhalidwe a simenti ya Portland ndi monga kukhazikika ndi kuuma mwachangu, mphamvu yoyambirira, kutentha kwambiri, kukana chisanu bwino, kukana dzimbiri, kuchepa pang'ono pakuuma, komanso kukana kuwonongeka kwambiri. Ndi yoyenera ntchito za simenti yamphamvu kwambiri komanso malo otentha pang'ono, koma si yoyenera simenti yamphamvu kwambiri kapena malo otentha kwambiri, komanso malo owononga.

Simenti Yosagonjetsedwa ndi Sulfate: Simenti ya Portland yosagonjetsedwa ndi sulfate imagawidwa m'magulu awiri kutengera kukana kwake ku sulfate: simenti ya Portland yosagonjetsedwa ndi sulfate yapakatikati ndi simenti ya Portland yosagonjetsedwa ndi sulfate yapakatikati. Simenti ya Portland yosagonjetsedwa ndi sulfate yapakatikati ndi chinthu chopangira simenti ya hydraulic chomwe sichimaukiridwa ndi kuchuluka kwapakati kwa ma sulfate ions, chopangidwa pogaya clinker ya simenti ya Portland yokhala ndi kapangidwe koyenera ndikuwonjezera gypsum yokwanira. Simenti iyi imatchedwa P·MSR. Simenti ya Portland yosagonjetsedwa ndi sulfate yapamwamba ndi chinthu chopangira simenti ya hydraulic chomwe sichimaukiridwa ndi kuchuluka kwa ma sulfate ions, chopangidwa pogaya clinker ya simenti ya Portland yokhala ndi kapangidwe koyenera ndikuwonjezera gypsum yokwanira. Simenti iyi imatchedwa P·HSR.

Zinthu Zofunika pa Simenti Yosagonjetsedwa ndi Sulfate: Simenti yolimbana ndi Sulfate ndi simenti yapadera yopangidwa kuti isawonongedwe ndi sulfate. Imapangidwa kuchokera ku clinker ya simenti ya Portland yokhala ndi gypsum yokwanira yowonjezera. Kutengera ndi kukana kwake sulfate, ndi yoyenera mapulojekiti omwe ali ndi sulfate kwa nthawi yayitali, monga madoko, mapulojekiti osungira madzi, ndi nyumba zapansi panthaka, komanso malo omwe ali ndi sulfate-corrosive media, monga zomera zamankhwala ndi malo oyeretsera zinyalala.

Simenti yokhala ndi aluminiyamu yambiri: Simenti yokhala ndi alumina yambiri ndi chomangira cha hydraulic chopangidwa ndi calcined ndi ground clinker chomwe chimapangidwa makamaka ndi calcium aluminate ndipo chili ndi alumina pafupifupi 50%. Chimadziwikanso kuti simenti yotsutsa kapena simenti ya aluminate. Kapangidwe kake ka mankhwala makamaka kamakhala ndi aluminiyamu oxide Al₂O₃ ndi calcium oxide CaO, yokhala ndi ma oxide ena ochepa monga SiO₂ ndi Fe₂O₃. Kuchuluka kwa aluminiyamu oxide nthawi zambiri kumakhala kopitilira 50%, kokwera kwambiri kuposa kwa simenti wamba. Kuchuluka kwa aluminiyamu kumeneku kumapatsa mphamvu zambiri zodabwitsa.

Makhalidwe abwino a simenti ya alumina yokhala ndi aluminiyamu yambiri

• Mphamvu Yoyambirira: Chizindikiro chodziwika bwino cha simenti yokhala ndi aluminiyamu yambiri ndi kukula kwake mwachangu kwambiri. Pakatha maola 24 kuchokera pamene yathiridwa, imatha kufika pa 80% ya mphamvu yake yomaliza. Katunduyu amawapangitsa kukhala abwino kwambiri pa ntchito zovuta monga zomwe zimafuna kuchotsedwa mwachangu, kukonza mwadzidzidzi, komanso kumanga m'nyengo yozizira.
• Kukana Kutentha Kwambiri: Madzi ochokera ku simenti ya alumina yokhala ndi aluminiyamu yambiri amakhala okhazikika kutentha kwambiri. Ikatenthedwa, imakumana ndi vuto la gawo lolimba, ndikupanga mchere watsopano wonga ceramic womwe umasunga mphamvu zina. Nthawi zambiri umagwiritsidwa ntchito ngati chomangira m'ma castable osasunthika komanso m'zipinda za uvuni zamafakitale, ndipo umatha kupirira kutentha kwambiri.
• Kukana Kudzimbidwa: Ndi yolimba kwambiri ku kuukira kwa mankhwala ndi ma sulfate, ma acid ofooka, ndi mankhwala ena kuposa simenti wamba ya Portland. Izi zili choncho chifukwa zinthu zake zothira madzi sizipanga calcium hydroxide ndi calcium aluminate hydrate, zomwe zimawopsezedwa ndi sulfate. Izi zimapangitsa kuti ikhale yothandiza kwambiri m'malo owononga, monga malo osungira mankhwala, zimbudzi, ndi zomangamanga za m'madzi.